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Sinonasal 1 Sept. 2001 Catholic University of Louvain, St - Luc University Hospital Head and Neck Oncology Programme Nasal cavity and paranasal sinuses carcinoma

Nasal cavity and paranasal sinuses carcinoma

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Page 1: Nasal cavity and paranasal sinuses carcinoma

Sinonasal 1Sept. 2001

Catholic University of Louvain, St - Luc University HospitalHead and Neck Oncology Programme

Nasal cavity and paranasal sinuses carcinoma

Page 2: Nasal cavity and paranasal sinuses carcinoma

Sinonasal 2Sept. 2001

Catholic University of Louvain, St - Luc University HospitalHead and Neck Oncology Programme

Nasal cavity and paranasal sinuses carcinoma

•• WorkWork--up procedureup procedure

•• TNM stagingTNM staging

•• Primary treatmentPrimary treatment

•• FollowFollow--upup

•• Treatment of recurrent and/or Treatment of recurrent and/or metastaticmetastatic diseasedisease

•• ReferencesReferences

Page 3: Nasal cavity and paranasal sinuses carcinoma

Sinonasal 3Sept. 2001

Catholic University of Louvain, St - Luc University HospitalHead and Neck Oncology Programme

Clinical evaluation Evidence Option

l complete history of the diseasel professional evaluationl weight and weight lossl performance status (Karnofsky / ECOG-WHO)l evaluation of cranial nerves and audiometryl fiberoptic examination of H&N mucosal neck examinationl drawing of any lesionsl biopsy (using endoscopic endonasal approach)

Type CType CType CType CType CType CType CType CType C

Std.Std.Std.Std.Std.Std.Std.Std.Std.

Page 4: Nasal cavity and paranasal sinuses carcinoma

Sinonasal 4Sept. 2001

Catholic University of Louvain, St - Luc University HospitalHead and Neck Oncology Programme

Advanced clinical evaluation Evidence Option

l Ophthalmologic examinationl Dental examination by oral surgeonl Prosthetic rehabilitation (if maxillectomy)l Neurosurgery examination (depending on surgical

approach)l Plastic surgery examination (depending on surgical

approach)

Type CType CType CType C

Type C

Std.Std.Std.Std.

Std.

Page 5: Nasal cavity and paranasal sinuses carcinoma

Sinonasal 5Sept. 2001

Catholic University of Louvain, St - Luc University HospitalHead and Neck Oncology Programme

Laboratory tests Evidence Option

l hemogram, coagulation tests, liver enzymes, kidney function

l pituitary function: cortisol, TSH, free T4, LH, FSH, GH, free testosterone and testosterone (male only), progesterone and oestradiol (female only), prolactine, IGF-1

l thyroid function: TSH (if radiotherapy scheduled)

Type C

Type C

Type C

Std.

Std.

Std.

Page 6: Nasal cavity and paranasal sinuses carcinoma

Sinonasal 6Sept. 2001

Catholic University of Louvain, St - Luc University HospitalHead and Neck Oncology Programme

Imaging Evidence Option

l Loco-regional: CT scan and MRI1

l Panoramic dental X-rayl Metastatic work-up: chest X-ray, thoracic spiral

CT scanl Additional examination depending on previous

findingsl PET scanl Face / sinus standard X-ray

Type CType CType C

Type C

Type 3Type 3

Std.Std.Std.

Std.

Invest.Indiv.

1See guidelines for loco-regional imaging

Page 7: Nasal cavity and paranasal sinuses carcinoma

Sinonasal 7Sept. 2001

Catholic University of Louvain, St - Luc University HospitalHead and Neck Oncology Programme

Pathologic examination Evidence Option

Standards of the British Royal College ofPathologists (endorsed by EORTC)1

Type C Std.

1See pathology guidelines

Page 8: Nasal cavity and paranasal sinuses carcinoma

Sinonasal 8Sept. 2001

Catholic University of Louvain, St - Luc University HospitalHead and Neck Oncology Programme

Nasal cavity and paranasal sinuses carcinoma

•• WorkWork--up procedureup procedure

•• TNM stagingTNM staging

•• Primary treatmentPrimary treatment

•• FollowFollow--upup

•• Treatment of recurrent and/or Treatment of recurrent and/or metastaticmetastatic diseasedisease

•• ReferencesReferences

Page 9: Nasal cavity and paranasal sinuses carcinoma

Sinonasal 9Sept. 2001

Catholic University of Louvain, St - Luc University HospitalHead and Neck Oncology Programme

Staging Evidence Option

l TNM classification (5th ed., 1997)l WHO International Classification of Diseases for

Oncology (ICD-O 9 or ICD-O 10)l Specific staging for nasal cavity carcinoma and

esthesioneuroblastoma

Type CType C

Type C

Std.Std.

Std.

Page 10: Nasal cavity and paranasal sinuses carcinoma

Sinonasal 10Sept. 2001

Catholic University of Louvain, St - Luc University HospitalHead and Neck Oncology Programme

TNM/AJCC 1997 StagingTNM/AJCC 1997 StagingMaxillary sinus:

• Tx: primary tumor cannot be assessed• T0: no evidence of primary tumor• T1: tumor limited to the antral mucosa with no erosion or destruction of bone• T2: tumor causing bone erosion or destruction, except for the posterior antral wall, including

extension into hard palate and/ormiddle nasal meatus• T3: tumor invades any of the following: bone of posterior wall of maxillary sinus,

subcutaneous tissues, skin of cheek, floor or medial wall of orbit, infratemporal fossa, pterygoid plates, ethmoid sinuses

• T4: tumor invades orbital contents beyond the floor or medial wall including apex and/or any of the following: cribriform plate, base of skull, nasopharynx, sphenoid sinus, frontal sinus

Ethmoid sinus:• Tx: primary tumor cannot be assessed• T0: no evidence of primary tumor• T1: tumor confined to ethmoid with or without bone erosion• T2: tumor extends into nasal cavity• T3: tumor extends to anterior orbit and/or maxillary sinus• T4: tumor with intracranial extension, orbital extension including apex, involving sphenoid

and/or frontal sinus and/or skin of nose

Page 11: Nasal cavity and paranasal sinuses carcinoma

Sinonasal 11Sept. 2001

Catholic University of Louvain, St - Luc University HospitalHead and Neck Oncology Programme

TNM/AJCC 1997 StagingTNM/AJCC 1997 Staging

• N0: no regional node metastasis• Nx: regional nodes cannot be assessed• N1: single ipsilateral node, ≤ 3 cm• N2a: single ipsilateral node, > 3 cm and ≤ 6 cm• N2b: multiple ipsilateral nodes, ≤ 6 cm• N2c: controlateral or bilateral nodes, ≤ 6 cm• N3: node > 6 cm

Page 12: Nasal cavity and paranasal sinuses carcinoma

Sinonasal 12Sept. 2001

Catholic University of Louvain, St - Luc University HospitalHead and Neck Oncology Programme

TNM/AJCC 1997 StagingTNM/AJCC 1997 Staging

•• Mx: DistantMx: Distant metastasis cannot be assessedmetastasis cannot be assessed•• M0: No distantM0: No distant metastasismetastasis•• M1: DistantM1: Distant metastasismetastasis

Page 13: Nasal cavity and paranasal sinuses carcinoma

Sinonasal 13Sept. 2001

Catholic University of Louvain, St - Luc University HospitalHead and Neck Oncology Programme

Specific stagingSpecific staging

Nasal cavity (University of Florida):• Stage I: limited to site of origin• Stage II: extension to adjacent sites(eg orbit, nasopharynx, paranasal sinuses, skin,

pterygomaxillary fossa)• Stage III: base of skull or pterygoid plate destruction; intracranial extension

Esthesioneuroblastoma (Kadish):• Stage A: disease confined to the nasal cavity• Stage B: disease confined to the nasal cavity and one or more paranasal sinuses• Stage C: disease extending beyond the nasal cavity and the paranasal sinuses, including

involvement of the orbit, base of the skull or intracranial cavity, cervical lymph nodes, or distant metastasis

Page 14: Nasal cavity and paranasal sinuses carcinoma

Sinonasal 14Sept. 2001

Catholic University of Louvain, St - Luc University HospitalHead and Neck Oncology Programme

Nasal cavity and paranasal sinuses carcinoma

•• WorkWork--up procedureup procedure

•• TNM stagingTNM staging

•• Primary treatmentPrimary treatment

•• FollowFollow--upup

•• Treatment of recurrent and/or Treatment of recurrent and/or metastaticmetastatic diseasedisease

•• ReferencesReferences

Page 15: Nasal cavity and paranasal sinuses carcinoma

Sinonasal 15Sept. 2001

Catholic University of Louvain, St - Luc University HospitalHead and Neck Oncology Programme

Primary treatment for the neck Evidence Option

l N0: elective treatment (ND or radiotherapy depending on thetreatment of the primary T) of both sides of the neck is indicatedwhen tumor extends to the nasopharynx and/or soft palate

l > N0: appropriate ND on both sides of the neck + postoperativeRxTh1

Type 3

Type 3

Std.

Std

1 see guidelines for post-operative radiotherapy

Page 16: Nasal cavity and paranasal sinuses carcinoma

Sinonasal 16Sept. 2001

Catholic University of Louvain, St - Luc University HospitalHead and Neck Oncology Programme

Primary treatment: surgical procedure of the “T” site: Ethmoïdsinus

Evidence Option

l T1-T2: - surgery: external approach ± post-op RxTh1 endoscopic approach ± post-op RxTh1

l T3: - surgery: external approach ± post-op RxTh1

- Type I-II-IVb: frozen section- Type III-IVa: exenteration- Type ethmoïd roof I: frozen section- Type ethmoïd roof II: craniofacial resection with

or without maxillectomy + post-operative RxThl T4: - surgery using craniofacial resection if tumor does not

extend to: - bilateral apex, bilateral periorbita - cavernous sinus - massive infratemporal fossa

+ post-operative RxTh - definitive RxTh for unresectable tumor for surgical or medical reason

Type 3Type 3Type 3

Type 3

Type 3

Std.Indiv.Std.

Std.

Indiv.

1 see guidelines for post-operative radiotherapy

Page 17: Nasal cavity and paranasal sinuses carcinoma

Sinonasal 17Sept. 2001

Catholic University of Louvain, St - Luc University HospitalHead and Neck Oncology Programme

Primary treatment: surgical procedure of the “T” site:Esthesioneuroblostoma

Evidence Option

l T1: - surgery using transfacial approach + post-operative RxTh if positive section(s)

l T2-T4: - surgery using craniofacial resection + post-operative RxTh

Type 3

Type 3

Std.

Std.

Page 18: Nasal cavity and paranasal sinuses carcinoma

Sinonasal 18Sept. 2001

Catholic University of Louvain, St - Luc University HospitalHead and Neck Oncology Programme

Primary treatment: surgical procedure of the “T” site:Maxillary sinus

Evidence Option

l T1-T2: - partial maxillectomy ± post-operative RxTh1

l T3: - total maxillectomy + post-operative RxThl T4: - radical maxillectomy +/- exenteration, +/- cranio-

facial resection + post-operative RxTh - definitive RxTh for unresectable tumor for surgical or medical reasons

Type 3Type 3Type 3

Type 3

Std.Std.Std.

Indiv.

1 see guidelines for post-operative radiotherapy

Page 19: Nasal cavity and paranasal sinuses carcinoma

Sinonasal 19Sept. 2001

Catholic University of Louvain, St - Luc University HospitalHead and Neck Oncology Programme

Primary treatment: specific pathology Evidence Option

l Extra-nodal lymphoma: chemotherapy ± RxThl Plasmocytoma: RxThl Rhabdomyosarcoma: induction chemotherapy followed ,

according to tumor response, by RxTh or surgery + post-operative RxTh

Type 3Type 3Type 3

Std.Std.Std.

Page 20: Nasal cavity and paranasal sinuses carcinoma

Sinonasal 20Sept. 2001

Catholic University of Louvain, St - Luc University HospitalHead and Neck Oncology Programme

Nasal cavity and paranasal sinuses carcinoma

•• WorkWork--up procedureup procedure

•• TNM stagingTNM staging

•• Primary treatmentPrimary treatment

•• FollowFollow--upup

•• Treatment of recurrent and/orTreatment of recurrent and/or metastaticmetastatic diseasedisease

•• ReferencesReferences

Page 21: Nasal cavity and paranasal sinuses carcinoma

Sinonasal 21Sept. 2001

Catholic University of Louvain, St - Luc University HospitalHead and Neck Oncology Programme

Follow-up Evidence Option

l Clinical examination-cavity cleaning and general ENT examination

including neck palpation and fiberoptic examination every 2 months (first 2 years), every 6 months (3rd-5th year), then every year (> 5 years)

-dental examination every 6 monthsl Imaging

-loco-regional: CT-scan or MRI after 6 months, then 6-12 months later

-chest X-ray every yearl Laboratory tests

-thyroid function (TSH) every year if radiotherapy delivered on the neck

-pituitary function every year if RxTh delivered on the pituitary gland

l Evaluation of late toxicity (EORTC/RTOG) scale

Type C

Type C

Type C

Type C

Type C

Type C

Type C

Std.

Std.

Std.

Std.

Std.

Std.

Std.

Page 22: Nasal cavity and paranasal sinuses carcinoma

Sinonasal 22Sept. 2001

Catholic University of Louvain, St - Luc University HospitalHead and Neck Oncology Programme

Nasal cavity and paranasal sinuses carcinoma

•• WorkWork--up procedureup procedure

•• TNM stagingTNM staging

•• Primary treatmentPrimary treatment

•• FollowFollow--upup

•• Treatment of recurrent and/or Treatment of recurrent and/or metastaticmetastatic diseasedisease

•• ReferencesReferences

Page 23: Nasal cavity and paranasal sinuses carcinoma

Sinonasal 23Sept. 2001

Catholic University of Louvain, St - Luc University HospitalHead and Neck Oncology Programme

Salvage treatment for recurrent disease: general principle

Treatment will depend on:l Site and extension (rTNM stage)l Previous treatment(s)l Performance statusl Patient wishes

Page 24: Nasal cavity and paranasal sinuses carcinoma

Sinonasal 24Sept. 2001

Catholic University of Louvain, St - Luc University HospitalHead and Neck Oncology Programme

Salvage treatment for recurrent disease Evidence Option

l rT1-rT3 N0-M0-surgery ± RxTh1

-RxTh-chemotherapy

l rT4, any N, M0-chemotherapy-best supportive care

l T0-anyrN-M0-ND-RxTh-chemotherapy

l Metastasis-chemotherapy-best supportive care

Type CType CType C

Type CType C

Type CType CType C

Type CType C

Std.Indiv.Indiv.

Std.Std.

Std.Indiv.Indiv.

Std.Std.

1depending on previous radiotherapy

Page 25: Nasal cavity and paranasal sinuses carcinoma

Sinonasal 25Sept. 2001

Catholic University of Louvain, St - Luc University HospitalHead and Neck Oncology Programme

Nasal cavity and paranasal sinuses carcinoma

•• WorkWork--up procedureup procedure

•• TNM stagingTNM staging

•• Primary treatmentPrimary treatment

•• FollowFollow--upup

•• Treatment of recurrent and/or Treatment of recurrent and/or metastaticmetastatic diseasedisease

•• ReferencesReferences

Page 26: Nasal cavity and paranasal sinuses carcinoma

Sinonasal 26Sept. 2001

Catholic University of Louvain, St - Luc University HospitalHead and Neck Oncology Programme

•Christopher Perry, Paul A. Levine, Brian R. Williamson, Robert W. Cantrell Preservation of the eye in paranasalsinus cancer surgery. Acta Otolaryngol Head Neck Surg 114 ; June 1988•Dan M. Fliss, Gideon Zucker, Avi Cohen, Aharon Amir, Amiram Sagi, Lior Rosenberg, Alberto Leiberman, AlbertGatot, Eli Reichenthal Early outcome and complications of the extended subcranial approach to the anterior skull base. Laryngoscope 109 : January 1999•Daniel Brasnu, Ollivier Laccourreye, Vincent Bassot, Laurent Laccourreye, Philippe Naudo, François-Xavier RouxCisplatin-based neoadjuvant chemotherapy and combined resectin for ethmoid sinus adenocarcinoma reaching and/orinvading the skull base. Arch Otolaryngol Head Neck Surg 122 : 765-768 ; 1996•Dennis H. Kraus, Bruce M. Sterman, Howard L. Levine, Benjamin G. Wood, Harvey M. Tucker, Pierre Lavertu Factors influencing survival in ethmoid sinus cancer. Arch Otolaryngol Head and Neck Surgery 118 : 367-372 ; 1992•Dennis H. Kraus, Jay K. Roberts, Benjamin G. Wood, Sharon V. Medendorp, Harvey M. Tucker, Howard L. Levine, Pierre Lavertu. Monsquamous cell malignancies of the paranasal sinuses. Ann Otol Rhinol Laryngol 99 : 1990•Fernando L. Dias, Geraldo M. Sa, Jacob Kligerman, Janio Nogueira, Mario L. Galvao, Roberto A. Lima Prognostic factors and outcome in craniofacial surgery for malignant cutaneous tumors involving the anterior skull base. Arch Otolaryngol Head Neck Surg 123 : 738-742 ; 1997•George A. Sisson, Dean M. Toriumi, Raja A. Atiyah Paranasal sinus malignancy : a comprehensive update. Laryngoscope 99 : February 1989•Homayoon Shidnia, Ned B. Hornback, Nassir Saghafi, Edgardo Sayoc, Raleigh Lingeman, Ronald Hamaker The roleof radiation therapy in treatment of malignant tumors of the paranasal sinuses. Laryngoscope 94 : January 1984

ReferencesReferences

Page 27: Nasal cavity and paranasal sinuses carcinoma

Sinonasal 27Sept. 2001

Catholic University of Louvain, St - Luc University HospitalHead and Neck Oncology Programme

•Hugh E. Hetherington, Joseph Toljanic, William E. La Velle, Ann Fyler Bilateral maxillectomy and midfacialreconstruction. Ann Otol Rhinol Laryngol 104 : 1995•J.D. Osguthorpe Sinus neoplasia. Arch Otolaryngol Head and Neck Surg, vol 120 ; Jan 1994•James H. Simon, Weining Zhen, Timothy M. McCulloch, Henry T. Hoffman, Arnold C. Paulino, Nina A. Mayr, John M. Buatti Esthesioneuroblastoma : the university of Iowa experience 1978-1998 Laryngoscope 111 : 488-493 ; 2001•Jarrod J. Homer, Nick S. Jones, Patrick J. Bradley The role of endoscopy in the management of nasal neoplasia.American Journal of Rhinology 11 : 41-47 ; 1997•Jatin P. Shah, Dennis H. Kraus, Mark H. Bilsky, Philip H. Gutin, Louis H. Harrison, Elliot W. Strong Craniofacial resection for malignant tumors involving the anterior skull base. Arch Otolaryngol Head Neck Surg 123 ; Dec 1997•Joel A. Sercarz, Rufus J. Mark, Ian Storder, Luu Tran, Thomas C. Calcaterra Sarcomas of the nasal cavity and paranasal sinuses. Ann Otol Rhinol Laryngol 103 ; 1994•Juan R. Rodrigo, Jose Fernandez, Carlo Suarez, Justo Gomez, Jose L. Llorente, Augustin Herrero Malignant fibrous histocytoma of the nasal cavity and paranasal sinuses. American Journal of Rhinology 14 : 427-431 ; 2000•Kwok Hung Yu, Simon C.H. Uy, Peter M.L. Teo, Anthony T.C. Chan, Winnie Yeo , John Chow Nasal lymphoma :results of local radiotherapy with or without chemotherapy. Head Neck 19 : 251-259 ; 1997•Mamoru Miyaguchi, Schun-Ichi Sakai, Hitoshi Takashima, Hironobu Hosakawa Lymph node and distant metastasesin patients with sinusal carcinoma. The Journal of Laryngology and Otology 109 : 304-307 ; 1995

ReferencesReferences

Page 28: Nasal cavity and paranasal sinuses carcinoma

Sinonasal 28Sept. 2001

Catholic University of Louvain, St - Luc University HospitalHead and Neck Oncology Programme

•Margaret S. Brandwein, Adina Rothstein, William Lawson, Carol Bodian, Mark L. Urken Sinonasal melanoma.Arch Otolaryngol Head Neck Surg 123 : 290-296 ; 1997 •Neil Bhattacharyya, Allan F. Thornton, Michael P. Joseph, Max L. Goodman, Philip C. Amrein Successful treatmentof esthesioneuroblastoma and neuroendocrine carcinoma with combined chemotherapy and proton radiation. Arch Otolaryngol Head Neck Surg 123 : 34-40 ; 1997•P. Janecka, Chandranath Sen, Laligam Sekhar, Hugh Crtin Treatment of paranasal sinus cancer with cranial basesurgery : results. Laryngoscope 104 : May 1994•Patricia K. Ha, David W. Eisele, Frank J. Frassica, Marianna L. Zahurak, Edward F. McCarthy Osteosarcoma of thehead and neck : a review of the Johns Hopkins experience. Laryngoscope 109 : 964-969 ; 1999•Paul A. Levine, Richard Gallagher, Robert W. Cantrell Esthesioneuroblastoma : reflections of a 21-year experience. Laryngoscope 109 : 1539-1543 ; 1999•Paul A. Levine, W. Copley McLean, Robert W. Cantrell Esthesioneuroblastoma : the university of Virginiaexperience 1960-1985 Laryngoscope 96 : July 1986•Paul P. Knegt, Kim W. Ah-See, Lilly-Ann vd Velde, Jeroen Kerrebijn Adenocarinoma of the ethmoidal sinuscomplex. Arch Otolaryngol Head Neck Surg 127 : 141-146 ; 2001•Pierre Lavertu, Jay K. Roberts, Dennis H. Kraus, Howard L. Levine, Benjamin G. Wood, Sharon V. Medendorp, Harvey M. Tucker Squamous cell carcinoma of the paranasal sinuses : the Cleveland Clinic experience 1977-1986 Laryngoscope 99 : November 1989•R. Christopher Miyamoto, Lyon L. Gleich, Paul W. Biddinger, Jack L. Gluckman Esthesioneuroblastoma and sinonasal undifferentiated carcinoma : impact of histological grading and clinical staging on survival and prognosis. Laryngoscope 110 : 1262-1265 ; 2000

ReferencesReferences

Page 29: Nasal cavity and paranasal sinuses carcinoma

Sinonasal 29Sept. 2001

Catholic University of Louvain, St - Luc University HospitalHead and Neck Oncology Programme

•Ralph P, Nahysh A. Mokadam, Kathleen T. Montone, Gregory S. Weinstein, Ara A. Chalian, Patricia F. Wolf,Randal S. Weber Malignant tumors of the nose and paranasal sinuses : hospital of the university of Pennsylvania.Experience 1990-1997 American Journal of Rhinology 13 : 117-123 ; 1999•Ricardo L. Carrau, John Segas, Daniel W. Nuss, Carl H. Snyderman, Ivo P. Janecka, Eugene N. Myers, FrankD’Amico, Jonas T. Johnson Squamous cell carcinoma of the sinonasal tract invading the orbit. Laryngoscope 109 :February 1999•Ronald H. Spiro, Elliot W. Strong, Jatin P. Shah Maxillectomy and its classification. Head and Neck ; July 1997•Saman Naficy, Michael J. Disher, Ramon M. Esclamado Adenoid cystic carcinoma of the paranasal sinuses.American Journal of Rhinology 13, 4 : 311-314 ; 1999•Shane R. Smith, Peter Som, Adham Fahmy, William Lawson, Steve Sacks, Margaret Brandwein Aclinicopathological study of sinonasal neuroendocrine carcinoma and sinonasal undifferentiated carcinoma. Laryngoscope 110 : 1617-1622 ; 2000•Steven P. Davison, Davis A. Sherris, Bradly Meland An algorithm for maxillectomy defect reconstruction. Laryngoscope 108 : February 1998•Timothy W. Bolek, Robert B. Marcus Jr, Nancy Price Mendenhall Solitary plamacytoma of bone and soft tissue. Int. J. Radiation Oncology Biol. Phys. 36, 2 : 239-333 ; 1996•V. Svane-Knudsen, K.E. Jorgensen, O. Hansen, A. Lindgren, P. Marker Cancer of the nasal cavity and paranasal sinuses : a series of 115 patients. Rhinology 36 : 12-14 ; 1998•W. Scott McCary, Paul A. Levine, Robert W. Cantrell Preservation of the eye in the treatment of sinonasal malignant neoplasms with orbital involvement. Arch Otolaryngol Head Neck Surg 122 ; June 1996•William I. Wei, Chiu M. Ho, P W. Yuen, Ching F. Fung, Jonathan S.T. Sham, Kam H. Lam Maxillary swingapproach for resection of tumors in and around the nasopharynx. Arch Otolaryngol Head Neck Surg 121 : June 1995

ReferencesReferences